Strategies in the 2D numerical modelling of wood transport in rivers

Castellet, Ernest Bladé i; Juny, Martí Sánchez; Ruíz-Villanueva, Virginia

doi:10.1201/9781315644479-362

Cited by 6 publications

(9 citation statements)

References 2 publications

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“…The value of C d fluctuates as a function of water velocity, flow direction, dimensions and relative position of wood piece, water density, and viscosity, and also with changing Reynolds number. That is why Bladé et al (2016) recommend calibration and validation of C d when the dynamic modeling approach is applied.…”

Section: Model Limitations and Future Challengesmentioning

confidence: 99%

Numerical Modeling of Potential Large Wood Entrainment in Rivers: Application of Hybrid Modeling in the Inter‐Dam Reach of the Dyje River, Czechia

Hlavňa,

Máčka,

Záthurecký

2024

Water Resources Research

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Mobilization of large wood in river channels during floods represents a hazardous factor, augmenting flood risk and endangering infrastructures such as bridges, weirs, and reservoir dams. A hybrid modeling approach combining numerical models with field‐based surveys has been recently used to elucidate the processes of LW entrainment and deposition in rivers. We used two‐dimensional hydraulic modeling performed in HEC‐RAS to simulate LW entrainment in two valley bottom segments of the Dyje River, Czechia, where LW deposition is a significant hazard to the dam of the downstream Znojmo reservoir. We surveyed all LW pieces in the inundation area of the 2002 extreme (>Q100) flood and simulated their entrainment for eight flood scenarios (1–100‐year recurrence interval). We used the equations of Braudrick and Grant (2000, https://doi.org/10.1029/1999WR900290) to calculate the LW entrainment threshold; we introduced coefficient k accounting for the incomplete submersion of LW pieces resting on an inclined surface into the original equations. Four entrainment categories — stable, wetted stable, wetted buoyant, and wetted entrained — were defined, and the proportion of LW pieces in each category was calculated for the flood scenarios. We found marked differences in entrainment categories for respective flood scenarios between the two valley segments. These were attributed to the differences in pieces' dimensions, their spatial distribution within the inundation area, and valley‐bottom topography, which affects the hydraulic conditions for a given discharge. The presented approach enables the calculation of the LW quantity potentially mobilized by the flood of a certain magnitude indicating the degree of potential risk for the infrastructures located downstream.

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Section: Model Limitations and Future Challengesmentioning

confidence: 99%

Numerical Modeling of Potential Large Wood Entrainment in Rivers: Application of Hybrid Modeling in the Inter‐Dam Reach of the Dyje River, Czechia

Hlavňa,

Máčka,

Záthurecký

2024

Water Resources Research

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“…They also allow inclusion of effects related to backwater rise and the presence of the cross‐sectional obstruction by wood in hazard delineation (Ruiz‐Villanueva, Bodoque, et al, ). Nevertheless, experimental and field data are required to further reduce uncertainty in the modelling approaches and to validate numerical model results (Bladé, Sánchez‐Juny, & Ruiz‐Villanueva, ). However, the lack of field data, especially regarding wood transport during high‐magnitude flood events (Comiti et al, ), is a major constraint.…”

Section: Knowledge Gaps Future Research and Implications For Managementioning

confidence: 99%

In‐channel wood‐related hazards at bridges: A review

Cicco

Paris

Ruíz-Villanueva

et al. 2018

River Research & Apps

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In-channel wood is a key component in fluvial ecosystems; however, transport of inchannel wood during floods can create hazards in urbanized areas. Among the main problems is wood accumulation at bridges, which reduces flow openings, causes blockage and inundation of nearby areas and, eventually, results in structures collapsing. Increasing awareness of the importance of the ecological role of wood in rivers calls for a compromise between the preservation of river ecosystems and management strategies for the prevention of wood-related hazards. In recent years, knowledge related to in-channel wood dynamics and hazards has notably increased, and a significant body of valuable information can be found in an extensive number of studies. This review provides a comprehensive summary of the most relevant advances regarding in-channel wood-bridge interactions. We review the factors controlling wood accumulation formation and summarize the different approaches used to analyse this process, namely, physical and numerical modelling. Finally, we conclude by highlighting the most important knowledge gaps, addressing particularly underresearched fields and stressing the remaining challenges.

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“…The incipient motion of logs is determined in the model by the balance of forces acting on the centre mass of the log following the approach of Braudrick and Grant (2000), but adjusted to the two dimensions. Details about the model are provided by Ruiz-Villanueva et al (2014a and Bladé et al (2016).…”

Section: Numerical Modelling Of Lw Dynamics and Related Hazardsmentioning

confidence: 99%

“…Further developments should try to overcome some of these constrains (e.g. Allen and Smith, 2012;Bladé et al, 2016).…”

Section: Numerical Modelling Of Lw Dynamics and Related Hazardsmentioning

confidence: 99%

Assessing and mitigating large wood‐related hazards in mountain streams: recent approaches

Mazzorana

Ruíz-Villanueva

Marchi

et al. 2017

J Flood Risk Management

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The assessment and mitigation of floods in mountain streams, when large wood (LW) is transported, pose several challenges. The process chain consisting of flood propagation, LW recruitment, entrainment, transport, and entrapment triggers, at critical sections such as bridges, unexpected and exacerbated impacts to the exposed built environment. We provide a review on the recent advances in modelling LW dynamics during extreme river floods through computational approaches. Moreover, we describe how scaled flume experiments can enhance process understanding at critical flow sections such as bridges to address risk mitigation problems. Additionally, we present a framework based on Formative Scenario Analysis (FSA) to allow for expert knowledge integration and to subsequently derive consistent hazard process scenarios in steep mountain streams where the application of computational approaches is less reliable. Finally, we discuss how the application of the presented set of assessment methods can support integral flood risk management by explicitly considering LW dynamics since the effectiveness of mitigation critically depends on the acquired process understanding.

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Strategies in the 2D numerical modelling of wood transport in rivers

Cited by 6 publications

References 2 publications

Numerical Modeling of Potential Large Wood Entrainment in Rivers: Application of Hybrid Modeling in the Inter‐Dam Reach of the Dyje River, Czechia

Numerical Modeling of Potential Large Wood Entrainment in Rivers: Application of Hybrid Modeling in the Inter‐Dam Reach of the Dyje River, Czechia

In‐channel wood‐related hazards at bridges: A review

Assessing and mitigating large wood‐related hazards in mountain streams: recent approaches

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